Shell

The shell is a bridge between command and hardware.The shell works in two ways: interactive, batch dispositionInteractive: A user enters a command at a time, the shell translates and executes aBatch processing: The user makes multiple commands into

Path and command search orderBash Pit WelcomeBash Environment configuration fileTerminal settingswildcard characters and special symbolsThe TTY1~TTY6 command interface reads some key settings for the local computerUse Stty to view key contents[Email

Post Address: http://keep88.blog.51cto.comBo main name: Li ChangmingThis note is from------and the old boy learn Linux OPS "shell programming Combat"Directory:Core basic knowledge and practice of shell variables1. Variable type:Environment variables

[Email protected]_48_191_centos 456]# vim 2.sh#!/bin/bash #加入这行, which means that the interpreter is bash, no plus, I'm CentOS, the default is bashEchoecho $[Email protected]_48_191_centos 456]#/2.sh 1./2.sh1[Email Protected]_48_191_centos

Standard input: 0 Standard output: 1 >,>> or 1>,1>>Error Output: 2 2>>,2>/dev/null 这个设备，是linux 中黑洞设备，什么信息只要输出给这个设备，都会给吃掉 Send standard output, error output to/dev/null$ ls test.sh test1.sh >/dev/null 2>&1,1 represents the standard output 2

If ElseRead-p ' Please enter the score: ' Scoreif [$score-lt 60]; Thenecho ' 60 points below ' Elif [$score-lt 70]; Thenecho ' 60-70 minutes between ' elif [$score-lt 80]; Thenecho ' 70-80 minutes between ' elif [$score-lt];thenecho ' 80-90 minutes '

Backing up MBR, root partition, boot partition#!/bin/bashBak_dir=/mnt #已挂载的移动硬盘或其他外设Mbr= ' fdisk-l |grep ' Disk ' |awk nr==1 ' {print $} ' |awk-f '/' ' {print $} ' |sed s/://g 'root= ' df |awk '/\//{print} ' |awk nr==1 ' {print $} 'boot= ' df |awk '/

Add 20 users to the CLASS01 group in bulk, the user name begins with STD, ends with a number, format: STD01---STD20Method 1#!/bin/shgroupadd class01a=stdfor ((i=1;iMethod 2:#!/bin/bashgroupadd class01for i in {1..20}doif [$i-lt];thenuseradd "std0$i"-

Netstat netstat-print network connections, routing tables, interface statistics, masquerade connections, and Mul Ticast Memberships See Parameters: -A (All) displays all options and does not show listen related by default-

The && (Command execution Control) syntax is formatted as follows: Command1 && command2 [&& Command3 ...] 1 use && connection between commands to implement logic and functions. 2 only the command on the left of && returns True (command return value $

Brief introductionAwk is a powerful text analysis tool, with the search for grep and the editing of SED, which is especially powerful when it comes to analyzing data and generating reports. To put it simply, awk reads the file line-by-row, using

Today to write blog only to find before there is no written, my God, I was asleep ...1, what is a shell?The shell is a unix/linux system with software that acts as an interface between the kernel and the user, reads the user's input command, sends

1. Regular expressions1) ^ Start * Previous character repeats more than 0 times+ More than 1 times? 0 or 1 times. An arbitrary character (. *){m,n} m to n times[0-9] [A-z] any number or letter$ end Character2) sed and awk commandsSed ' match

Select Use AloneCat select01.sh #!/bin/bashecho "which car do you prefer?" Select CAR in Benz Audi volkswagendo Breakdoneecho "you chose $CAR"Run resultsSH select01.sh which car do you prefer?1) Benz2) Audi3? 1You chose BenzSelect and case are used

[email protected] ~]# cat sanjiaoxing.sh #!/bin/bash# Crushlinux# 2017-04-10 Read-p "Please enter the length of the equilateral triangle one side:" Longfor ((a=1;aa;b--)) #控制空格输出 Do echo -n "" Donefor C in ' seq 1 $a ' #输出所在行数相同的数字个数do echo-n "$a"

Bash is a powerful scripting language, which is the default shell in many Linux occurrences, supports variables and special characters, and looks at what special characters it has:; Command delimiter, you can write multiple commands in one line;;

First, the implementation of the discovery of the ADB shell into the device and no longer continue to execute/system/plugin/....ExitAll the online search is bat file call adb shell, no sh file call adb shell does not go down, look for other

Instance: Generate temporary file record Apache process number, kill Apache process, Delete temp file 1#!/bin/Bash2#create_log. Sh3 4#1. Get the process number to all httpd applications5#2. Deposit the process number in a temporary

#SIZE 10Direct Insert Sortvoid Insert_sort () {int i,j;int array[size+1];ARRAY[]={0,12,23,11,55,2,34,18,20,48,22};for (i=2;iArray[0]=array[i];J=i-1;while (Array[0]ARRAY[J+1]=ARRAY[J];j--;}ARRAY[J+1]=ARRAY[0];}}Binary Insert Sortvoid

1. Minimization of All ProgramsUses comobj;  var shell:olevariant;begin Shell: = Createoleobject (' shell.application '); Shell.minimizeall;end;2. Minimizing other programsspy++ 查找要最小化的程序classnamevar Indicador :Integer;begin // Find the window